Boot and shoe sewing machine.



FATENTES MAR. 31, 1908.

M. T. DEFINE.

BOOT AND SHOE SEWING QEAUEINH APPLIOA'HON' FILED APR.

3 SHEBTS-SHEIIT 1.

jhmntor Wimmmsi mm wm&m

PATENTED MAR. 31, 1908.

M. TJDENNB.

BOOT AND SHOE SEWING MAGHINE.

APPLICATION FILED APB. 7.1905.

3 SHEETSSBEET 2.

m. iv WW 7.. i? w w m .u an 6% No. 883,300 PATEN TED MAR. 31, 1908.

M. T. DENNE;

B001 AND SHOE SEWING" MACHINE APPLIOATIOH FILED APE, 7.19195.

3 SHEETS-SHEET 3.

mfnwsmv lzwenfar the ri'ed by an arm which MARK THOMAS DENNE, or RUSHEEN,WJQNGLMJD, ASSIGNOB To JOirlN; GAVE AND SUNS,

LIMITED, OF RUSHDEIJ, ENGLAND.

noo'r Ann .sncnsswme MACHINE.

Specification of Letters Patent.

Patented March 31,

Applicationfiled April 7, 1905. Serial No. 254,306.

To all whom it. may concern: 7

Be it known that 1, MARK THOMAS DENNE, a subject oi'the King of Great Britain, of Rushden', Northamptonshire,England, have invented new and useful Improvements in Boot and Shoe Sewing Machines, of which the following is a specification.

In chain-stitchmachines it is important that the welt-guide during-its travel should preserve the angle of the settin of its front with. the horizontal, which cannot be .varied without introducing errors in its adjustment w th respect to the work, while it is also important that the point on the welt held by it which is to be pierced by the needle should be kept in a constant position with respect to the needle oint whatever the position of the guide. is therefore necessary to perfect working to combine these two essential points which as far as I am aware has not reviously been attempted.

It wil be obvious that a circular-motion round the needle center as in the loci: stitch machine will not ell-cot the object in view as that end of the welt-guide farthest from the,

center would describe a lar er arc of a cirlcle 1111 "j a nearer point, so altering the angle with respect to the horizontal.

[According to the said invention I re move the shuttle race and shuttle of the l'o'clo'stitch mech anism and apply in itssplace bracket on which. a weltguide carrier moving in a curved path, is mounted, the said carrier being so arranged that thef weltguide, the position of which corresponds with sition of the welt-guide in the. lock- ;inachine, moves in the path of the stitcncedle', to a certain extent, the said carrier connected by a link to the existing welt-guide locking mechanism and receiving its motion therefrom.

g In carrying out my invention 1 make use of a carrier working in a slot in a bracket, the

said slot being so -curved as to give the required movement. The stroke or" the mam 'tal-:e-up is reduced to the required extent to pull uptheloop of the chain titch.

In order to provide means whereby the needle thread w ll he looped over the barb of hitherto -.heen. usual, I.

the form of an eye l0]? the a' circular motion about the needle. in prac ango a .loop'er in edle thread can used to describe a tice, this motion is one which, heginning on one side of the needle at a point in line with it, passes completely round the needle and finishes at a point on the opposite side to the starting point. The position of thelooper is maintained until the needle is withdrawn into the work when the looper is returned di reotly across its path. The arm. carrying the e tor the needle thread is mounted. upon a s-aft capable of receiving a rocking motion and a'longitudinal motion in the frame, and these motions are imparted to the shaft from suitable cams on the main shalt or the machine, the longitudinal motion being ob-- tained from a face cam and/the rocking motion from a groove in a barrel cam.

i To enable the invention to be 'iully unden stood it will now be described. with referenceto ,tl1e accompanying drawings, in which Figure l is a side elevation of a wellng machine provided with the improvements according to this invention. Fig. 2 is a side elevation. of the welt-guide mechanism detached. Fig. 3 is a sectional plan of a part of such mechanism, and Fig. 4 is a section on the line 44, Fig. 2. Fig. 5 is an underside view of the looper mechanism, and Fig. (i is a side elevation. of the said' rneclianismv detached. Fig. 7 is a section on the line F, '7, F ig. 1, looking in the direction of thearrd but drawn to a larger scale. Fig. is asimilar view showing the parts in another posi tion.

I will first describe such, known giants of the machine will enable me to make my invention clear.

a is the main frame main or driving chant; s the curved needle (Z is the awl; e is the main talidup lQV'Gf-"flf-5 the plate pivoted axially "with the in. le wl'iics 'lormorly carried the welt-guide 51 but is now con icted'thereto in the manner here-- provided with the segnun of teeth f and is connec' l the spring I" to the frame of the m is the pawl designed to engage n th the aid in after descrihcd and which is teeth and lock the welt guide who i c )assim throu 'h the "or;

h i I n.

1 or the teeth when placing w? l need. he i :rnaclnne; i. is ,tl shaft 3) for open y and Ofgifllfttllfiil bv the p. o ire o while being ever and 7' ii paw. h and eve k to the weltgui c upon by the owl relieve the work i l, the f in) groove is, however, of the form hereinafter described. Z is the looper for engaging the thread with the bar-b of the needle.

I will now describe the improvements.

on is the fitting or bracket which '1' arrange in the place of the shuttle race and shuttle of the machine and n is the carrier for the welt-guide g, which carrier is designed to move in a curved path in the said fitting, the said carrier for. this urpose being advantageously formed witi curved flanges c, working in corres'mnding grooves in a slot in the litting m (ll'ig. i).

is the link connecting the carrier n to the plate 7" of the welt-guide locking mechanism so as to enable the said welt-guide to be locked. and released as hereinbefore described. [is the movements of the weltguide result, by reason of its connection to the plate f, in imparting movements to the said plate in opposite directions to those of the corresponding plate in machines in which the welt-guide is carried. by the said plate, the canngroove k is made with the part that operates thelever 7c (for relieving the pressure of the said weltguide upon the work. while being fed by the awl d) nearer to the center of the shaft ('1 than the concentric part of the said groove as clearly shown in Fig. 2.

By the described construction it will be seen that the wclt-guide during its travel will approximately preserve the angle of the setting of its front face with the horizontal and at the same time maintain the point at which the welt is pierced by the need? in the constant position with respect to the needle point, wnatevor the position of the said uide.

The stroke of the main take-up lever e is reduced to the required extent by suitably altering theshape of its operating cam.

r is the eye in. the looper Z through which ye the thread from the take-up lever to the work.

3 the shaft carrying the loopor arm, the said shat ocing 2l1'lil11{-? .l in bearings i, ion the frame a in. which it can be both rocked and mowed longitu di o a lly.

u is the cam-groove in the face of the disk 11. on the shalt Z) for imparting longitudinal movement to the shaft tl'ie said movement being effected through the medium of a lever 12 pivoted to a bracket to attached to the frame a, one end of the said lever carrying a cam-roll 1) en aging the groove it while the other end of t 1e lever is jointed to the shaft 8. The rocking movement of the shaft 5 imparted to it from the cam-groove a: in he peri )hery of the'disk it through the medium of a ever 1 also pivoted to the bracket one end of which lever carries a cam-roll 1/ while the other end of the said lever is provided with a pivoted block 3 engaging a lork y on the loo er arm.

By tliis construction, assuming the looper to be in its normal position at one side of the needle as shown in Figs. 1, 5 and 7, the cam grooves a and :10 will, when the shaft 6 is rotated in the direction of the arrow, move the looper around the needle in the direction of the arrow Fig. 7 one and a half times, the looper at the end-of this movement being in the position shown in Fig. 8. By this move ment of the looper the thread carried thereby is looped one and a hall times round the needle as indicated in the said figure. After the needle has withdrawn the loop of thread through the work the cam groove will return the looper to its normal position.

Having now particularly described and ascertained the nature of my said invention and in what .manner the same is to be performed, I declare that what I claim is:

In a chain stitch machine for sewing welts to boots and shoes, the combination with the needle of the looperprovided with an eye for receiving the thread, said looporbcing -1nounted on an arm provided with a fork at its outer end and secured to a shaft mounted to rock and slide in its bearings, a lever connected to said shaft and a lover engaging the said forked end of the said arm and'mechanism to actuate said lovers, the relation of the needle and the loopcr eye being such that the movements given the shaft carry the thread entirely around the needle, substantially as described.

iviA'ltK TliOivlAS DENNIS.

Witnesses:

JOHN E. Bousrinhn, (I. G. itnnrnnu. 

